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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc20ecb97ce26e11d876d5628eb07a8f0a9ade881df282ee1b214f84faf55bab' 
  AND token = 'AGyOokK5C7xx/hVjbzZmdR87P5q2AqrjfRqnHNsh894=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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