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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91214f9a4220883d4b96b92b7af49b84e617abc736d419f89c25bcb2c02d2e09' 
  AND token = 'QSUmbyq/Xn1Lr0VL03XsNmtm0udd4CpIJKso7ZZFbgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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