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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f269c7176ef38afdce3050d3da0987e9639a4007cdc1a11d97095d198bf05be' 
  AND token = '83s5kQ0ZUJ4PbcG005N/xlL7jr69IHmMbfvTOq2WTY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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