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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65848ee66c004c9d0f796064a2eae8f59a0ffeb8887cb0f734dc68ff95881725' 
  AND token = 'yLINFmlFbtanZEtPpLXiuBCaFOmteBfQXEdTTHgZqJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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