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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28288bb37e5e5e662fffb6f03c5d88b214b8ff8e6dead46e701997cf766c90cd' 
  AND token = '+vwhgHlKgIe39xlIgcn1VEOrF5udBTi9BjkWWEeqyuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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