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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa93758f533dd4f30959c7bbacfc91b28282d4827adaa8fe8a83e49e2659ad1' 
  AND token = 'VLxWbxK2Ws9rujGXZkkDqCumi+WAh2ebL1wDe6iKanI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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