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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ec42ddf994e211ed9d83fd9733d9a37e4d5241d0673f571422f859786c1c6d' 
  AND token = 'OM+ClKL6U3+d+4jboq7BgwaR7ffnnZx4tgbr1bB+Vj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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