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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be42bbf2433fcf6c7b1df043680aacde08e5314e3cff6c57269f70f13d07b2d' 
  AND token = 'lT+gclhjn1GXu2Vu7HqJciG1LC/nnRqp3t3psL249Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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