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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7aca5039be5f8f7974634af853d6b545abd3687508a6511c4b462d41670fb55' 
  AND token = 'kxUqpmW5BVtLNqSeVq/b27RtgyaxZWfUpHmtBhAbUmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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