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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84ab3e43101b910575874c7d03c23ac83ca0105dc2b177b86aebf8ada1ee83b' 
  AND token = '27iw6gzVtlx9t7SzsSe7van+6Eu0G6q/mFvHd0S1FDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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