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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a0449284cafa29d05d42828475de301b8296487bfe7792a973851556ce9ac6' 
  AND token = 'CYRm60/6rAO6gyeuU45uFsCDPdI94VCut6m1pV/IRwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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