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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a91a95ddf846d54a9f1f47d3b86329d6e843ac812adb4d2a2f84af91f34325' 
  AND token = 'tVSc4JuGF/V8JWfE4XOlZDxAjj506h6Tck9GZHaNf6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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