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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbba88b22bef4bae6b2b852b7cb1715d6ce20d83763290fe69bde4cf32dc2644' 
  AND token = 'XhMuMhP4m5Pci3TnivPbGEDvWNX/KjgMt1g1gCsbhKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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