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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2232e351abeeb98c87761ef960dc9d61d083eb08075f74aca47979ec87b4f90' 
  AND token = '4bPzZQQa4V/p5sCHPvfAj6Ov42aayzy8jMap8nnzrAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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