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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5012d36153ea0a666d544bea639e61df955c1e1b8738dd631e3df75603cdd4eb' 
  AND token = '+EfrjqO6DmTxWyNO8Xtca/1NT1/dO73IbYwKhBfcXIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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