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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d009ed0b71e218894080b1d8daab313817f212d1e0636f5931d2afcd231b9b' 
  AND token = 'SRdy8h1VcN6UEQQNWiG+PTLAJxWJVdzckBqWF4dIlvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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