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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056ec93de7f49dea57d5dd8c3dc4e8375b09cc262abca048091d546328b40ff0' 
  AND token = 'jV8ug3JGHaTGdHWD4Kr42GXsalMdCjSanhnYKgcD9Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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