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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a9b70e278a8f2c375225b964db9fd8e68f1fdea61b110560676d23615771d4' 
  AND token = '6knnslqm6FvA1gjkp2W3UTCSYiM9Z/XehOgzgu1NSk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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