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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40a9faa1167d8fbcf549f3d2942d02cacec9690a7f52d1a75386ac2d80ecc9c' 
  AND token = 'Akq48f6wkEo/V8A4qM4zgCFBywhyScOkEOrtSum2TVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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