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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b460a88577e5e08df0a242ab314160cf3fcbbc35e019f2eabe101c386d666d97' 
  AND token = 'OnJTR72HikOgGWPVvDRVeewgJgVvfczPeq4xa/HDStQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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