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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b595df9ad2f031ab9bda0d0d4df194d5f996991deb5b9df10c39371aa8ba6f' 
  AND token = 'H0vBUD1ZOMCe75UU1B7QcUIfJfQ+VjVjCAZ3oBWG3+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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