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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c9ed796cdd0c5ccd04183c9ab2e957eb771755c5bb0cff7c090b737afb75c4' 
  AND token = '0gYUfh2eQDv2pqHEsMaSlYgm64KHuBsrG9m3bRJf2l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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