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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6549faa09e400121ab35fed39cd174df38e86483d5f1ec03a63a5fe5ae890d91' 
  AND token = 'Y1M6fgcI6BMdrf9cC4uB1Mk1gxNNzyUHeP+NdOCIPU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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