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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b46c18d10ff5bdd144569a24b5cc5040baf7e1a1b006991ca4b062fbca5d67' 
  AND token = 'eETAZa/uP1qKjjGlX0yGit8Q0At62m3M3lgi6A9CPoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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