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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32389101c35b6212fa824d004ff9ff9879f5eae58d4f7cb9f91265f52a997878' 
  AND token = 'jPBdVUiUu4y9cUdT+8rEiU7pvhznO6dQa4HP8EMnQSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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