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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99086bdf25417e197768b22fed9f0feda92ccd049e5a3cd5049245aa5a3e3a7' 
  AND token = 'F6rtXel8FSyYOUvGSZLmJ3RkNn2lVH2rBqGnoddw8Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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