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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f112814930d8c2afccf9443145e9bc3da4e7e6d098e423b901be03cf63ac1b69' 
  AND token = '/LstnvSEZDLICz7hrkOkhfPmOm8tvnnSuR2eTVbzf1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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