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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cbe2df4dbace43f0f5aadb8b539ac391c5f4548342631c17b00aa8bf4fe932' 
  AND token = 'pUXi834YqifsqZS3fwcty8Wg6El2lcrPpHJ0nCOubuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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