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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addfcbaad31e894e2e2f6005e9b865bb640ec76c9548a835130e302e3b42ecb3' 
  AND token = 'CJLeX6C3RU8Un5GzYKeTh2RsN+VnikljtiuwEi7WwDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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