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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf52a2b7893570c26e89c6cafa7a97850725997fae8332427e762896b143da0d' 
  AND token = 'ML5k2+Ovv+KCwRTzo/VkT0Fj2E4R8OANy9VZ0tjcdw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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