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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c108f74271deffa6e0672baf6710664b10a9cde0864cc6752312ac8fb6d8b15' 
  AND token = '3Q9/FSKOPf3nXtw7Sbd+jsjQVv3BnhbIvhIK1cNa0CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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