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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2d86b0ce9aa43afeb4f078d416e5202dba31dbcd3bf150edca2019a2b509d8' 
  AND token = 'dGa+28TV8rA2V3rMb4qU9SIHjudcXBOah7cPBDXaZAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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