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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc25a9a68255d3f6790473987880b5eb2324a33cdf60616ce573967b37767f75' 
  AND token = 'pRbZGtn5+m5R0/yoaHO2T7BDzhAGH7k7WXkrUosmFgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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