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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8fdf1c3b67c4014ee8340062b667059672d2b87d9f2ba856714733fbd51c03' 
  AND token = 'zdRaDRllyFbFg94nffAheT61SU2OyiCTHHkAmZLikQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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