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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a2d02ba08c0b3befb8ec1a1cd9df118de7bc1720d78c26fa33d6090e62a3d7' 
  AND token = 'Mn94/Z2MxGW/PPRFI/N8zTbCfkzlawCjWBslKMKNV0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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