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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f19927fa4609b72e961be81259dc267f580c07cdf831d33dd611d8d64f7468' 
  AND token = 'n0ix+5ocac5eFjT8lprrwyVOBmfV6zusK4tH0g1GGlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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