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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfe989658dd6ef112a9acdce33b274c983f9a5308d26f1c80c38098c17f7b23' 
  AND token = 'TE1jwF9Y85BE4DVXYBuYCGOc5c4w4cVkydJhurz5s7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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