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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964b71be44ef3e63655b279bf8d03c94373bf786ee98eb10597f5217478877f4' 
  AND token = 'PenLCpHsqRGkrxUVUeNi6S4Emr9jV9Z/KPpBrKCiA18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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