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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2c5e0c5b3a75a714ed53869601fcab5e8fc4713fe036fb832eba9456fa7725' 
  AND token = 'LhXjL62A2AgNpZi4WiLsI/O8fb2/Saq9Rzz7y0/XakQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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