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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c36f53bd166d3e2e9a035be36621822920eee04d90fe75a87eceffae2522b80' 
  AND token = '/4inao86vRbua7AQO+4GVlGIb/hWUChNPHIEvZs3+dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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