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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9030bc327403922bb6ead8405630c9f3ab4162f3aefba2f971178eae50161967' 
  AND token = 'pNfdA/ajDOMvT2aRjL3XpIgyUrrmSg9/r8rry4YXMvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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