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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a94cf1e5bdf4e40e37abdc2b83c906d58cb2bc870389f8c05ae8c928c26624' 
  AND token = '7A92bIvYU94d7Es2+pmxkwOA6bR7AkemuVvnBfExI5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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