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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920ea273c65644ea92dccf72ea31545bab5feed5fe0e5a486854cf13411fa8a3' 
  AND token = 'i7dLnAVMMyBL+mJDWrI9dqPamhOi2TyRmpz6rAKQvxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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