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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ec6b0f95e4a7e2fc321c50b8a3a78feb3e7d953fdcadad3f1a44f3b5c8c0dc' 
  AND token = '9Nn6LWno9odIJBFrLOPi8gyGzr5JKi2s/YK6IlqLpFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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