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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf647894f92e76276b7f3a12a22733496edf50efde9715ef42a79c9cc2c5eb2' 
  AND token = 'giTdiuWEi5QcT9ht8RFlF46ZDIhBMTA/5TAk8w23ask=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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