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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d2c1739ddd2acbead32531bee61480be26b57c6b6f334d461fbe59c628c06f' 
  AND token = 'S5V/2whc25n+ceM6PD37M63e0YcLFt0vJJOWM2K6Aaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}