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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e7a5ab2751663e7d3d03d8737f1b3ee762ba1585e31c39b4b7e24ab7be1a36' 
  AND token = 'S3hKAqMfr5OiUt1Q39ZYMJDkBM3d6ttVJi2+Gc1iinI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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