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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00f4cb7503ab2d7ea57bcf26817e698f6ce59a88cdcfbb2a571c62b4cb0418a' 
  AND token = 'RtVFh5f1wH0pfD1pSUoWn1edk+Lt/P930sslULI6hWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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