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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0ecfba20093e715a9cee49564b588e90836509ade4404acae6d9c945839a7d' 
  AND token = '3foZpWk9qLzLc1M6DDSgtZ6DCujm1p//fyRXc+YbfdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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