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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aae5f2b8079991fa029e2ad49c2ce0d0ebb917f6aa8db88b9e58d71aa24e52' 
  AND token = 'rvZC3qCO8jtvaKkA1oj9Il0H5j8JqS50MP+62PpM33U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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