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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026f7892e50f029aa2b1a71cea1700a95ee1a374d6d42f2dec1695dca75643d2' 
  AND token = 'OoVZDaHd60ST2XFx1ebmT1G4+Nb3z+SzoJB94AtLw44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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