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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af23e594c80805c5a80f2f2558d173e0b3a1d1b75bace8ed9eebafb7b93d2e49' 
  AND token = 'ihD4gu2SrRZ4s8GFlXlUFlKsFZ17AOfhVkzGUzP5J10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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