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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087a20d8ff993939f6757d4f94f9df6a4c0f7d82a707c7a81a197438960ff1f0' 
  AND token = 'ChWKbHaeKhHe6uM1tl0bKShYsKXsyPkm/VK0py+aAHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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