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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f4db08c0e589f2939d4b00d6606f636a68b735a23f3bdd6a9946346da7e2a7' 
  AND token = 'BAU3AReNpqNsoXGXu7IR5Pdaw2f3Q86blVJjDRiDK0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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