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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13620289ec5e1e57e5fe7f0f40350dd49e8b79f4c39c0381b7244f88eaa3f62c' 
  AND token = 'TfzgbCNMxRshZipDkL6/UNLzQem/s9X5//8C72bQROM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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