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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029eb881231295657ff07481055451d5259bec7867ff90121bcb0049ac8081e5' 
  AND token = 'V9jhSw8sqMOShPdTS8P/OpaVv8JF6sH76cUjOBKT9mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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