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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd70ad9fe30b4aa0cb28653f7fadcba329dfbc8289aecfbccfc835fbebc425a' 
  AND token = 'YMFjjRMZbbltgGRQ9wfluf8vMgIS67T0QyuWjF1p2JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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