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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bac955eb4728a5ce25a304d3705e6db7bc892f16a7b060e41430b1717fa9a13' 
  AND token = '/0k42KbbjxOFZQDzAvseY/fCDlOQH/igw023qvrsODo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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