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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa9091f855ccb85eb06f47709125111d9dfcca28a70ce2e28ba593b2a9cf8be' 
  AND token = '8XBnwtd5IyGZuwd9sNz6OFhS7gfIW5kSNcWBhoyonQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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