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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b82704201ad162ed23143977889f843362d219648f1e6f49feecba0a7e8993' 
  AND token = 'cM7PCSv3uo/BxK4ibZNZu4cAw2mOqy9dz2NbnJjoX3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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