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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ebd50fe7ec66a06a54b70d737855f0b2d5eac03e031de103c5bd40c51f46dd' 
  AND token = 'vPW6fDaKst/MKDd/1F0yg1zQ9wbHbUoQa0wNHZiZczQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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